Answer:
an atom is the smallest particle of matter
a compound is a substance that has two or more atoms and element is the opposite of compound.
molecule is........,...............hope this helps
copper
A. Element
B. Compound
C.Homogeneous Solution
D. Heterogeneous
Answer:
A ) Element
Explanation:
cooper is an element
please help ill give brainly !!
when air is heated what happens to its density?
A ) It is increased because the molecules are moving together.
B ) It is increased because the molecules are moving apart.
C ) It is decreased because the molecules are moving together.
D ) It is decreased because the molecules are moving apart
Answer:
B.
Explanation:
The molecules are moving apart meaning that they move faster when heated and move slower when cooled
In an acid-base titration,
a. acid is never added to base.
b. base is added to acid or acid is added to base.
c. acid is always added to base.
d. base is always added to acid.
Answer:
b
Explanation:
An acid-base titration is an experimental procedure used to determined the unknown concentration of an acid or base by precisely neutralizing it with an acid or base of known concentration. ... It is filled with a solution of strong acid (or base) of known concentration.
La siguiente formula K2Cr2O7 corresponde al
Look at the diagram of a fuel cell below.
Which part of the fuel cell does A represent?
A. air
B. anode
C. cathode
D. electrolyte
Answer:
It is a electrolyte.
Explanation:
I took the test.
It represents an electrolyte.
What happens if electrolytes are low in the body?
A level under three can cause muscle weakness, spasms, cramps, paralysis, and respiratory problems. If it continues, kidney problems may occur.
What do electrolytes do for your body?Electrolytes are substances that have a natural positive or negative electrical charge when dissolved in water. They help your body regulate chemical reactions, maintain the balance between fluids inside and outside your cells, and more.
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If 45 grams of solid aluminum and 301 grams of ammonium perchlorate are reacted. How much excess reactant is left over? Show your work using equation editor.
Answer: Your balanced equation is 2Al + 3S --> Al_2S_3. In two separate equations, first use the 48.5g of Al to find the amount (in moles) of Al_2S_3. Then use the 62.8g of S to find the amount (in moles) of Al_2S_3. By doing these, you find which reactant (the Al or the S) produces the least amount of Al_2S_3. Since it's the S, that's the limiting reactant: you then use that 62.8g of S to find how many grams of Al will be used in the reaction. (Use the same balanced equation.) You find that 35.2g of Al will be used, then find the excess by subtracting that 35.19 from the original 48.5g. Your excess amount is 13.3g of Al!
Explanation:
hopefully this is what you were looking for <3 :)
The amount of excess reactant that left over the chemical reaction between aluminum and ammonium perchlorate is 0.9 moles.
How do we convert mass into moles?Mass into moles (n) will be converted by using the below equation as:
n = W/M, where
W = given mass
M = molar mass
Moles of 45g of Aluminum = 45g / 27g/mol = 1.66 mol
Moles of 301g of ammonium perchlorate = 301g / 117.4g/mol = 2.56 mol
Both reactants are reacted with each other and one of the reactant is fully consumed, so the excess reactant will be calculated as:
Excess reactant = 2.56mol - 1.66mol = 0.9 moles
Hence amount of excess reactant is 0.9 moles.
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Based on this information which of the following conclusions can be drawn about the growth rate of grass? hurry
_______is the division of the cytoplasm at the end of mitosis.
A
Gamete
B
Anaphase
C Prophase
D Cytokinesis
Answer: D. CYTOKINESIS
Explanation:
Mitosis ends with telophase, or the stage at which the chromosomes reach the poles. ... Telophase is followed by CYTOKINESIS, or the division of the cytoplasm into two daughter cells.
I NEED HELP ASAP PLZ LOOK AT THE PICTURE CAREFULLY!!!!
Answer:
it is a little fuzzy
Explanation:
According to the Lewis model of acids and bases, amines behave as bases in water because __________. View Available Hint(s) According to the Lewis model of acids and bases, amines behave as bases in water because __________. the hydrogens will bond with hydroxide ions to make water they produce hydroxide ions they donate the hydrogens they have as hydrogen ions the unshared pair of electrons on the nitrogen can accept a proton
Answer: the unshared pair of electrons on the nitrogen can accept a proton
Explanation:
According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs.
Amines have a general molecular formula of [tex]RNH_2[/tex] which has lone pair of electrons on nitrogen and thus is able to donate electrons to a lewis acid which is short of electrons. In other words nitrogen can accept a proton.
[tex]RNH_2+H^+\rightarrow RNH_3^+[/tex]
The pyruvic acid from glycolysis can be converted to acetic acid, which can enter the citric acid cycle. Because this process is a cycle, the atoms entering the cycle must balance the atoms that leave. Consider carbon balance in the citric acid cycle. How many CO2 molecules leave the cycle for each acetic acid molecule that enters? For this question, assume that carbon only enters as acetic acid and exits as CO2 . Note that acetic acid has two carbon atoms. You can determine the number of carbon atoms in carbon dioxide from its formula, CO2 .
Answer:
The correct answer is - 2CO2 or two molecules of carbon dioxide.
Explanation:
The TCA cycle or citric acid cycle is a central pathway of cellular respiration that helps in unifying several metabolites and generates energy for cellular functions. It takes place over eight different steps:
Step 1: Acetyl CoA enters the citric acid cycle that is a 2-carbon compound and attaches with 4-carbon compound oxaloacetate to form citrate a 6 carbon compound
Step 2: This 6-carbon compound isocitrate
Step 3: 5 carbon compound alpha-ketoglutarate is produced by oxidizing the isocitrate and release the release of carbon dioxide. One NADH molecule is formed.
Step 4: This 5 carbon molecule is oxidized again to form a four-carbon compound that binds with CoA to make forming succinyl CoA. A second molecule of NADH is produced, alongside a second molecule of carbon dioxide.
Step 5: Succinyl CoA is then converted to succinate with GTP formation
Step 6: Succinate is converted into fumarate with the generation of FADH₂ molecule.
Step 7: Fumarate is converted to malate
Step 8: oxaloacetate is formed with the NADH molecule.
Calculate the percent mass of hydrogen in ethane (C2H6).
Answer:
80.% carbon and 20.% hydrogen
Explanation:
Ethane has molecular formula C2H6. So What is the composition of carbon and hydrogen in ethane. its alot to explain but yea thats wht i got
Be sure to answer all parts. Given that syn addition of H2 occurs from both sides of a trigonal planar double bond, draw all stereoisomers formed when the compound is treated with H2. draw structure ... trans isomer draw structure ... cis isomer
Answer:
Following are the responses to the given question:
Explanation:
Please find the attached file for the solution.
or the formula C6H14 , calculate the index of hydrogen deficiency (IHD) and select all the types of unsaturation that might be present in the molecule based on the IHD. The IHD is Which types of unsaturation might be present
Answer:
See explanation
Explanation:
The term IHD means index of hydrogen deficiency. It tells us the number of missing hydrogen atoms from a given chemical formula. This number of missing hydrogen atoms corresponds to the number and type of multiple bonds in a given compound.
The formula for IHD is; IHD = C + 1 + N/2 – H/2 – X/2
C = Number of carbon atoms
N = Number of nitrogen atoms
H = Number of hydrogen atoms
X = Number of halogen atoms
Since;
N=0, X=0
Then;
IHD = C + 1 – H/2
Hence;
IHD = 6 + 1 - 14/2
IHD = 7 -7
IHD = 0
An IHD of 0 implies that there is no hydrogen deficiency or multiple bond in the molecule. It is purely a saturated compound.
of 4.3 x 10^2 - 7.0 x 10^2
Answer:
It is because the
Explanation:
Determine the number of moles in 258.45 grams of iron (III) chloride (FeCl3). Show and explain all
your work for full credit. Make sure you show all units.
Answer:
[tex]\boxed {\boxed {\sf 1.5935 \ mol \ FeCl_}}[/tex]
Explanation:
To convert from grams to moles, we must use the molar mass. This can be found on the Periodic Table. First, find the molar mass of iron and chlorine.
Fe: 55.84 g/mol Cl: 35.45 g/molCheck the formula. There is a subscript of 3 after Cl, so there are 3 atoms of chlorine in 1 molecule. Multiply iron's molar mass by 3, then add iron's molar mass.
FeCl₃: 55.84 + 3(35.45) = 55.84+106.35=162.19 g/molUse this number as a ratio.
[tex]\frac {162.19 \ g\ FeCl_3}{1 \ mol \ FeCl_3}[/tex]
Multiply by the given number of grams.
[tex]258.45 \ g \ FeCl_3 *\frac {162.19 \ g\ FeCl_3}{1 \ mol \ FeCl_3}[/tex]
Flip the ratio so the grams of iron (III) chloride cancel.
[tex]258.45 \ g \ FeCl_3 *\frac {1 \ mol \ FeCl_3}{162.19 \ g\ FeCl_3}[/tex]
[tex]258.45 *\frac {1 \ mol \ FeCl_3}{162.19}[/tex]
[tex]\frac {258.45 \ mol \ FeCl_3}{162.19}[/tex]
[tex]1.59350144892 \ mol \ FeCl_3[/tex]
The original measurement of grams has 5 significant figures, so our answer must have the same. For the number we calculated, that is the ten thousandth place.
[tex]1.5935 \ mol \ FeCl_3[/tex]
258.45 grams is approximately 1.5935 moles of iron (III) chloride.
The main function of the ozone layer is to shield the earth from the harmful ultraviolet rays of the sun.
O True
O False
Answer:
The Awnser is True. Hope that helps.
Answer:
true
Explanation:
Which option identifies all the bonds broken during this chemical reaction?
2H2 +O2 --> 2H2O
A. The bonds between the two hydrogen atoms and between the two oxygen atoms
B. The bonds between the two oxygen atoms
C. The bonds between oxygen and hydrogen atoms
D. The bonds between the two hydrogen atoms
Answer:
the bond b/w oxygen and hydrogen atom
Answer: A, the bonds between the two hydrogen atoms and between the two oxygen atoms.
What does Bolsa suggest as the next step in their investigation?
Answer:
A) call Billy Jo Jim Bob
Explanation:
Which one of the following substances is a solution?
A Clay
B Milky limewater
C Muddy water
D Syrup water
In this equation Ry stands for the Rydberg energy, and n stands for the principal quantum number of the orbital that holds the electron. (You can find the value of the Rydberg energy using the Data button on the ALEKS toolbar.) Calculate the wavelength of the line in the absorption line spectrum of hydrogen caused by the transition of the electron from an orbital with
The question is incomplete, the complete question is;
The energy E of the electron in a hydrogen atom can be calculated from the Bohr formula: =E−Ryn2 In this equation Ry stands for the Rydberg energy, and n stands for the principal quantum number of the orbital that holds the electron. (You can find the value of the Rydberg energy using the Data button on the ALEKS toolbar.) Calculate the wavelength of the line in the emission line spectrum of hydrogen caused by the transition of the electron from an orbital with =n10 to an orbital with =n8. Round your answer to 3 significant digits.
Answer:
162 * 10^-7 m
Explanation:
The Rydberg formula is;
1/λ= R(1/n2^2 - 1/n1^2)
R = Rydberg constant = 1.097 * 10^7 m-1
n2 = final state of the electron = 8
n1 = initial state of the electron = 10
Substituting values;
1/λ= 1.097 * 10^7(1/8^2 - 1/10^2)
1/λ= 1.097 * 10^7(1/64 - 1/100)
1 / λ = 1.097 10⁷ (0.015625 - 0.01)
1 /λ = 0.006170625 10⁷
λ = (0.006170625 10⁷)^-1
λ = 162 * 10^-7 m
Which plant part makes most of the food?
A. Roots
B. Fruit
C. Flower
D. Leaf
Which method is most appropriate for finding the age of the earth in years?
a.absolute dating
b.mass number counting
c.atomic number counting
d.radiometric dating
Answer: D
Explanation:
The radioactive dating is also called the radiometric dating. It involves the use of several radioactive substances like Argon, uranium, etc. The correct option is D.
What is radioactive dating?The method of dating rocks and minerals using the radioactive isotopes is defined as the radioactive dating. This method is very helpful to determine the age of igneous and metamorphic rocks which cannot be measured using correlation method.
Many different radioactive isotopes and methods can be used for dating. The elements like uranium and potassium contain a number of different isotopes whose half life is known exactly and thus the concentration of these isotopes within a rock or mineral can measure the age.
The method radiocarbon dating is also used for determining the age of archaeological carbonaceous objects such as wood samples or animal fossils by measuring the radioactivity of ¹⁴C present in them.
Thus the correct option is D.
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*An element has three naturally occuring isotopes with the following masses and abundances
Isotopic mass(amu):
27.977
28.976
29. 974
Fractional abundance:
0.9221
0.0470
0.0309
a. calculate the atomic weight of this element
b.What is the identity of the element?
Answer:
a. 28.08 amu
b. Silicon
Explanation:
Step 1: Given data
Isotope Isotopic mass (mi) Fractional abundance (abi)
²⁸X 27.977 amu 0.9221
²⁹X 28.976 amu 0.0470
³⁰X 29. 974 amu 0.0309
Step 2: Calculate the atomic weight (aw) of this element
We will use the following expression.
aw = ∑mi × abi
aw = 27.977 amu × 0.9221 + 28.976 amu × 0.0470 + 29. 974 amu × 0.0309
aw = 28.08 amu
Looking at the periodic table, the element with atomic weight = 28.08 amu is silicon.
A solution contains some or all of the ions Cu2+, Al3+, K+, Ca2+, Ba2+, Pb2+, and NH4+. The following tests were performed, in order, on the solution.
Addition of 6 M HCl produced no reaction.
Addition of H2S with 0.2 M HCl produced a black solid.
Addition of (NH4)2S produced a white solid.
Addition of (NH4)2HPO4 in NH3 produced no reaction.
The final supernatant when heated produced a purple flame.
Identify which of these ions were present in the solution, which were absent, and for which ones no conclusions can be drawn.
Answer:
See explanation
Explanation:
If we look at the tests to be performed on the compounds carefully, we will notice that;
i) Addition of H2S with 0.2 M HCl produced a black solid. This black solid may result from the reaction;
H2S + Cu2+ ---->CuS(balck solid) + H2
or
H2S + Pb2+ ---->PbS(balck solid) + H2
Hence, Cu2+ or Pb2+ may be present
ii) Addition of (NH4)2S produced a white solid. This means that K^+ may be present because the white precipitate is formed during metathesis.
iii) Potassium ion is known to burn with a purple flame.
Hence the suspected ions are;
Cu2+ , Pb2+ and K^+
Which of the following is an example of a process that absorbs energy?
gas converting to a liquid
solid coverting to a liquid
a substance freezing
temperature of a substance decreasing
Answer:
-Gas converting to a liquid
-Solid converting to a liquid
Explanation:
Endothermic process. It's absorb heat
Formal charge of Cl in CHCl3
The CO2 produced in one round of the citric acid cycle does not originate in the acetyl carbons that entered that round. If the acetyl-CoA is labeled with 14C at its carbonyl carbon, how many rounds of the citric acid cycle are required before 14CO2 is released
Answer:
It will require second round of the cycle to release [tex]14C0_2[/tex]
Explanation:
Reason behind the requirement of second round of the cycle to release [tex]CO_2[/tex] -:
The C4 carbon of succinyl CoA is acetyl from acetyl CoA. Succinyl CoA is converted to succinate, which is then converted to fumarate, fumarate, malate, and eventually oxaloacetate. 14C will be found in oxaloacetate at either C1 or C4. During the second round of the loop, each of these carbons will be converted to carbon dioxide.
How many protons and neutrons are in an atom of Cf-251 ?
Answer:
the protons are 98
and the neutrons are 153
you're welcome
but next time try to study harder.
What is the type of the synthesis reaction between Chromium + oxygen???
Answer:
Explanation: Reaction of oxygen with chromium(II) and chromium(III) porphyrins and synthesis of a .mu.-oxo chromium porphyrin derivative.
tion: